The vampire thing might svck.... DON'T FAST TRAVEL. You will wind up DOA. Trust me. It might svck because in order to get people to trade with you, you will have to feed, thereby negating your awesome vampire powers, when you get good and hungry.
I have a mage who's strength and endurance is the same as when it was starting out. He can only carry about 70 pounds beyond his normal kit, which isn't that much. He is extremely powerful, yet is a two-shot kill. Sometimes a one-shot kill if it's those blasted undead or vampires. Umm yeah, about that, I hunt you guys.
I get gold for your dust.
This playstyle of keeping your stats the same, keeps you on your toes. No more tanking. Pure strategy play only. It's the most exhilarating play I've ever done. I think you should go for it. Save a lot. After several characters in the DiD style, I've died more times with this mage than all my characters, EVER, combined.
^But don't be discouraged. Early levels will svck for a bit, then about level 9ish you should start rocking.
I don't think you need to max out luck. Sign of the Thief?
Illusion
Marksman
Blade
Mysticism
Sneak
and some others, but not Alchemy or Security. Keep those as minors.